Trying to stream images to Chrome and FireFox

We have images that are encrypted on our LAN.  I've built a process to pull and decrypt the images.   I then have a web page that will display the images to the user who requested this.  All this works fine in IE 11 (I haven't tried Edge because we are still on Win 7).  Now people are asking for it to work in Chrome and FireFox, where it is not working.  The code that is streaming the image is this:

        Dim bt As Byte() = pfile.FileArray
        Response.ContentType = "image/tiff"
        Response.AppendHeader("Access-Control-Allow-Origin", "*")
        'Response.AppendHeader("access-control-allow-credentials", "true")
        Try
            Response.BinaryWrite(deen.DeCrypt(bt, BuildEncKey(LocalFC))) 'This is decrypting and streaming the file (again, works in IE 11)
        Catch
            Response.BinaryWrite(bt)
        End Try

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On the page displaying the images, I tried hard coding a call in an image tag tag:

        <img id="tstimg" src="http://mysvr/pullfiles/pullfiles_encimg.aspx?kc=2573863&ekc=3c4c71f8e459d3ed2529c6a05b90956e&ob=028364&rand=20190604083928928" />

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But this just shows a broken image in Chrome and Firefox.  My end goal will be setting the URL for the images through JavaScript

                myImg = new Image();
                myImg.src = res[idx].img1;  //A URL like the one in the above img tag
                myImg1 = new Image();
                if (res[idx].img2 != '')
                    myImg1.src = res[idx].img2;  //A URL like the one in the above img tag
                myImg2 = new Image();
                if (res[idx].img3 != '')
                    myImg2.src = res[idx].img3;  //A URL like the one in the above img tag

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The above javascript is already in my code and it isn't working in Chrome or FireFox either.  So the ultimate question here is how do I stream the image from my server to Chrome and FireFox?  I really don't want to have to save the decrypted images locally (kind of defeats the purpose of encrypting the image if I end up having a decrypted version sitting on the server).